Discussion about LOB and ROB

Question

Hi all,

please follow two minutes my reason. I have problem with LOB and ROB, that are 0.

I try, try ,try but the problem remain. I not have problem until I want calculate LOB and ROB. The step by step indicate that flowpath channel with stream centerline. It's ok. The question is the follow:

Not must to be the same to Flowpath in left and Right, so the software calculate the LOB and ROB? 

Infact I dont have problem with Channel and the distance between cross sections it's ok!

Regards,

Antonio79

Answer 1

Antonio, I have downloaded and analyzed your case. Your Flowpaths table has only one object (Channel). You have to create two more - for left and right overbank and assign them type 'Left' and 'Right'. In general, you can copy the channel object, but you have to change the type attribute to Left and Right. Then your LOB and ROB lengths will be calculated. But I strongly encourage you to create proper flowpaths as your channel is curved and the LOB and ROB flowpaths length will differ much from the one of the channel.

Please, refer to the HEC-GeoRAS documentation for detailed explanation.

Comments

Ok, I find this answer for more time, thanks. I suggest you to insert this explane in step by step. So I can copy what layer, flowpath?
Thank you a lot, tomorrow try and after post if I resolve.
Kind Regards,
Antonio79

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Ok I have resolved, with LOB and ROB. Now go to next step..
Thank you.
Antonio79